Master presets that will store and change active presets in all stacks...kind of realtime arranger...i can of course assign the same key to all presets i want to use together but then i will not be able to change them in stack one by one...

Interesting -- I've had exactly that item on my list for a while, under the name "mixer scenes", but have let it sit as no one had requested it in a long time. I'll take this as a vote to revive the idea...